生态文明社会需构建城乡统筹的生态绿地系统

2007年10月,胡锦涛总书记在中国共产党第17届代表大会的工作报告中提出:建设生态文明,基本形成节约能源资源和保护生态环境的产业结构、增长方式、消费模式,使生态环境质量明显改善。生态文明观念在全社会牢固树立。       

扬州古运河风光带生态景观型林地模式的环境效应

对扬州古运河风光带生态景观型林地模式的环境效应进行了测定,结果表明:林地模式较对照能显著减少噪音3~10dB,叶片大而质硬并重叠排列的树种减噪效果较好;分枝低、树冠矮的乔木减噪作用要比分枝高、树冠高的乔木明显。林分内不同高度的光照强度分布,由林冠上层向林地表面逐步递减。       

湖北恩施种源红椿不同家系育苗试验初报

为了给湖北乡土树种红椿资源保护及开发利用提供基础数据,本研究以湖北恩施的6个红椿半同胞家系为材料,对其1年生实生苗木进行了生长量调查和分析,结果表明,6个不同红椿家系间当年生苗高、地径、叶长、叶宽、叶长宽比的差异均达到了显著水平,其中表现较好的是红椿2和3号家系.本研究取得的苗期生长数据在一定程度上客观反映了恩施红椿种源在武汉地区的适应性,可为今后武汉周边地区发展利用红椿提供良好借鉴.     

悬崖菊和孔雀造型菊造型制作技术

通过对悬崖菊和孔雀造型艺菊造型在新疆库尔勒地区的制作试验,详细了解、掌握艺菊造型制作技术的具体方法和相关措施,为今后造型艺菊在库尔地区栽培应用奠定了坚实的基础。       

南方雨雪冰冻造成林业重大损失的原因分析及预防对策建议——在全国政协第十一届一次会议上的书面发言

2008年1月中旬以来,受极端天气影响,我国大部分地区遭受了特大雨雪冰冻灾害。这次雨雪冰冻灾害持续时间之长、影响范围之广、危害程度之强、受灾情况之重,实属历史罕见。       

感受波恩城市林

走过了德国的许多城市.若抛开手头关于城市森林覆盖率的资料,就感受不到哪个城市的森林比别处多一些或少一些。满眼只见绿,明明暗暗深深浅浅的绿。       

Variations in wood anatomical properties and specific gravity of half sib progenies of Populus deltoides

We studied radial and inter-progeny variations in the dimensions of the wood elements and specific gravity of 21 half sib progenies of Populus deltoides Bartr. ex Marsh. The female parents of half sibprogenies were G48 and S7C13 clones. Variance ratio (F) test indicated that inter-progeny variations in the dimensions of wood elements andspecific gravity were significant for all wood traits while variations were significant for radial location for specific gravity only. Hierarchical cluster analysis was done by Squared Euclidean Distance for all of 21 progenies considering six wood traits. 21 progenies were grouped into 4 clusters. Cluster 1 was the largest cluster with 11 progenies, whereas cluster 3 had only one progeny. Selected progenies in clusters 3 (progeny 155,male) and 4 (progeny 108, 196, both female) were highly divergent from the other progenies so they were used in combinations as parents of hybrids to develop new clones with desired characters. Progeny 155 showed higher growth, fiber dimensions, and specific gravity, thus,should be used for the development of new clones.     

Carbon Accumulation and Fossil Fuel Substitution During Different Rotation Scenarios

Accumulation of carbon (C) in biomass and soil, and using forest residues for bioenergy are examples of forestry’s contribution to reducing the enhanced concentration of greenhouse gases in the atmosphere. The aim of this report was to study the effect of rotation length on carbon accumulation in biomass and soil, and on the amount of forest residues that could substitute fossil fuel during 2000–2100. Two models, based on inventory data from the Swedish National Forest Inventory, were used to simulate the effects of a changed rotation length in the region of Dalarna (1.8 × 10⁶ ha), in central Sweden. During the studied period, the accumulation of carbon in biomass was 32 kg C ha^?1 yr^?1 larger for the prolonged rotation period and 105 kg C ha^?1 yr^?1 smaller for the shortened rotation period compared with the base scenario. The build-up of carbon in forest soil was 23 kg C ha^?1 yr^?1 larger for the prolonged rotation than for the base scenario, whereas the shortened rotation was 24 kg C ha^?1 yr^?1 smaller than the base scenario. The potential to substitute fossil fuel was 37 kg C ha^?1 yr^?1 larger for the shortened rotation and 17 kg C ha^?1 yr^?1 smaller for the prolonged rotation compared with the base scenario. The annual accumulation of carbon in biomass decreased in all scenarios, which resulted in a prolonged rotation scenario possibly being a poor long-term solution (> 100 yrs). The amount of forest residues that could substitute fossil fuel increased in all scenarios during the studied period.     

Determination of fiber length and juvenile and mature wood zones in Acer velutinum Boiss. trees grown in Iran

In our investigation we studied fiber lengths and the transition age from juvenile to mature wood in Acer velutinum Boiss. For this purpose, samples from three normal maple trees at a Noshahr site in northern Iran were selected. Disks were cut at breast height. Test samples were taken along a radial direction from the pith to the bark, accounting for every ring during a 48-year period. We used the Franklin method to distinguish between fibers of juvenile and mature wood. The results show that the fiber length increased along the radial direction from the pith to the bark. The transition age between juvenile and mature wood was determined at the 14th annual ring from the pith.     

河西走廊城镇绿化树种引种栽培试验

十多年来,河西走廊引进各类观赏树种品种120余个,并对其生物学特性、栽培区划、繁育技术、水肥管理、越冬技术、造型和混交栽植等方面进行了研究,初步筛选出适于河西走廊城镇绿化的优良适生品种50多个。